"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.createFilterOptions = createFilterOptions;
exports.default = useAutocomplete;
var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));
var React = _interopRequireWildcard(require("react"));
var _utils = require("@mui/utils");
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
/* eslint-disable no-constant-condition */

// https://stackoverflow.com/questions/990904/remove-accents-diacritics-in-a-string-in-javascript
// Give up on IE11 support for this feature
function stripDiacritics(string) {
  return typeof string.normalize !== 'undefined' ? string.normalize('NFD').replace(/[\u0300-\u036f]/g, '') : string;
}
function createFilterOptions(config = {}) {
  const {
    ignoreAccents = true,
    ignoreCase = true,
    limit,
    matchFrom = 'any',
    stringify,
    trim = false
  } = config;
  return (options, {
    inputValue,
    getOptionLabel
  }) => {
    let input = trim ? inputValue.trim() : inputValue;
    if (ignoreCase) {
      input = input.toLowerCase();
    }
    if (ignoreAccents) {
      input = stripDiacritics(input);
    }
    const filteredOptions = !input ? options : options.filter(option => {
      let candidate = (stringify || getOptionLabel)(option);
      if (ignoreCase) {
        candidate = candidate.toLowerCase();
      }
      if (ignoreAccents) {
        candidate = stripDiacritics(candidate);
      }
      return matchFrom === 'start' ? candidate.indexOf(input) === 0 : candidate.indexOf(input) > -1;
    });
    return typeof limit === 'number' ? filteredOptions.slice(0, limit) : filteredOptions;
  };
}

// To replace with .findIndex() once we stop IE11 support.
function findIndex(array, comp) {
  for (let i = 0; i < array.length; i += 1) {
    if (comp(array[i])) {
      return i;
    }
  }
  return -1;
}
const defaultFilterOptions = createFilterOptions();

// Number of options to jump in list box when pageup and pagedown keys are used.
const pageSize = 5;
const defaultIsActiveElementInListbox = listboxRef => {
  var _listboxRef$current$p;
  return listboxRef.current !== null && ((_listboxRef$current$p = listboxRef.current.parentElement) == null ? void 0 : _listboxRef$current$p.contains(document.activeElement));
};
function useAutocomplete(props) {
  const {
    // eslint-disable-next-line @typescript-eslint/naming-convention
    unstable_isActiveElementInListbox = defaultIsActiveElementInListbox,
    // eslint-disable-next-line @typescript-eslint/naming-convention
    unstable_classNamePrefix = 'Mui',
    autoComplete = false,
    autoHighlight = false,
    autoSelect = false,
    blurOnSelect = false,
    clearOnBlur = !props.freeSolo,
    clearOnEscape = false,
    componentName = 'useAutocomplete',
    defaultValue = props.multiple ? [] : null,
    disableClearable = false,
    disableCloseOnSelect = false,
    disabled: disabledProp,
    disabledItemsFocusable = false,
    disableListWrap = false,
    filterOptions = defaultFilterOptions,
    filterSelectedOptions = false,
    freeSolo = false,
    getOptionDisabled,
    getOptionLabel: getOptionLabelProp = option => {
      var _option$label;
      return (_option$label = option.label) != null ? _option$label : option;
    },
    groupBy,
    handleHomeEndKeys = !props.freeSolo,
    id: idProp,
    includeInputInList = false,
    inputValue: inputValueProp,
    isOptionEqualToValue = (option, value) => option === value,
    multiple = false,
    onChange,
    onClose,
    onHighlightChange,
    onInputChange,
    onOpen,
    open: openProp,
    openOnFocus = false,
    options,
    readOnly = false,
    selectOnFocus = !props.freeSolo,
    value: valueProp
  } = props;
  const id = (0, _utils.unstable_useId)(idProp);
  let getOptionLabel = getOptionLabelProp;
  getOptionLabel = option => {
    const optionLabel = getOptionLabelProp(option);
    if (typeof optionLabel !== 'string') {
      if (process.env.NODE_ENV !== 'production') {
        const erroneousReturn = optionLabel === undefined ? 'undefined' : `${typeof optionLabel} (${optionLabel})`;
        console.error(`MUI: The \`getOptionLabel\` method of ${componentName} returned ${erroneousReturn} instead of a string for ${JSON.stringify(option)}.`);
      }
      return String(optionLabel);
    }
    return optionLabel;
  };
  const ignoreFocus = React.useRef(false);
  const firstFocus = React.useRef(true);
  const inputRef = React.useRef(null);
  const listboxRef = React.useRef(null);
  const [anchorEl, setAnchorEl] = React.useState(null);
  const [focusedTag, setFocusedTag] = React.useState(-1);
  const defaultHighlighted = autoHighlight ? 0 : -1;
  const highlightedIndexRef = React.useRef(defaultHighlighted);
  const [value, setValueState] = (0, _utils.unstable_useControlled)({
    controlled: valueProp,
    default: defaultValue,
    name: componentName
  });
  const [inputValue, setInputValueState] = (0, _utils.unstable_useControlled)({
    controlled: inputValueProp,
    default: '',
    name: componentName,
    state: 'inputValue'
  });
  const [focused, setFocused] = React.useState(false);
  const resetInputValue = React.useCallback((event, newValue) => {
    // retain current `inputValue` if new option isn't selected and `clearOnBlur` is false
    // When `multiple` is enabled, `newValue` is an array of all selected items including the newly selected item
    const isOptionSelected = multiple ? value.length < newValue.length : newValue !== null;
    if (!isOptionSelected && !clearOnBlur) {
      return;
    }
    let newInputValue;
    if (multiple) {
      newInputValue = '';
    } else if (newValue == null) {
      newInputValue = '';
    } else {
      const optionLabel = getOptionLabel(newValue);
      newInputValue = typeof optionLabel === 'string' ? optionLabel : '';
    }
    if (inputValue === newInputValue) {
      return;
    }
    setInputValueState(newInputValue);
    if (onInputChange) {
      onInputChange(event, newInputValue, 'reset');
    }
  }, [getOptionLabel, inputValue, multiple, onInputChange, setInputValueState, clearOnBlur, value]);
  const prevValue = React.useRef();
  React.useEffect(() => {
    const valueChange = value !== prevValue.current;
    prevValue.current = value;
    if (focused && !valueChange) {
      return;
    }

    // Only reset the input's value when freeSolo if the component's value changes.
    if (freeSolo && !valueChange) {
      return;
    }
    resetInputValue(null, value);
  }, [value, resetInputValue, focused, prevValue, freeSolo]);
  const [open, setOpenState] = (0, _utils.unstable_useControlled)({
    controlled: openProp,
    default: false,
    name: componentName,
    state: 'open'
  });
  const [inputPristine, setInputPristine] = React.useState(true);
  const inputValueIsSelectedValue = !multiple && value != null && inputValue === getOptionLabel(value);
  const popupOpen = open && !readOnly;
  const filteredOptions = popupOpen ? filterOptions(options.filter(option => {
    if (filterSelectedOptions && (multiple ? value : [value]).some(value2 => value2 !== null && isOptionEqualToValue(option, value2))) {
      return false;
    }
    return true;
  }),
  // we use the empty string to manipulate `filterOptions` to not filter any options
  // i.e. the filter predicate always returns true
  {
    inputValue: inputValueIsSelectedValue && inputPristine ? '' : inputValue,
    getOptionLabel
  }) : [];
  const listboxAvailable = open && filteredOptions.length > 0 && !readOnly;
  if (process.env.NODE_ENV !== 'production') {
    if (value !== null && !freeSolo && options.length > 0) {
      const missingValue = (multiple ? value : [value]).filter(value2 => !options.some(option => isOptionEqualToValue(option, value2)));
      if (missingValue.length > 0) {
        console.warn([`MUI: The value provided to ${componentName} is invalid.`, `None of the options match with \`${missingValue.length > 1 ? JSON.stringify(missingValue) : JSON.stringify(missingValue[0])}\`.`, 'You can use the `isOptionEqualToValue` prop to customize the equality test.'].join('\n'));
      }
    }
  }
  const focusTag = (0, _utils.unstable_useEventCallback)(tagToFocus => {
    if (tagToFocus === -1) {
      inputRef.current.focus();
    } else {
      anchorEl.querySelector(`[data-tag-index="${tagToFocus}"]`).focus();
    }
  });

  // Ensure the focusedTag is never inconsistent
  React.useEffect(() => {
    if (multiple && focusedTag > value.length - 1) {
      setFocusedTag(-1);
      focusTag(-1);
    }
  }, [value, multiple, focusedTag, focusTag]);
  function validOptionIndex(index, direction) {
    if (!listboxRef.current || index === -1) {
      return -1;
    }
    let nextFocus = index;
    while (true) {
      // Out of range
      if (direction === 'next' && nextFocus === filteredOptions.length || direction === 'previous' && nextFocus === -1) {
        return -1;
      }
      const option = listboxRef.current.querySelector(`[data-option-index="${nextFocus}"]`);

      // Same logic as MenuList.js
      const nextFocusDisabled = disabledItemsFocusable ? false : !option || option.disabled || option.getAttribute('aria-disabled') === 'true';
      if (option && !option.hasAttribute('tabindex') || nextFocusDisabled) {
        // Move to the next element.
        nextFocus += direction === 'next' ? 1 : -1;
      } else {
        return nextFocus;
      }
    }
  }
  const setHighlightedIndex = (0, _utils.unstable_useEventCallback)(({
    event,
    index,
    reason = 'auto'
  }) => {
    highlightedIndexRef.current = index;

    // does the index exist?
    if (index === -1) {
      inputRef.current.removeAttribute('aria-activedescendant');
    } else {
      inputRef.current.setAttribute('aria-activedescendant', `${id}-option-${index}`);
    }
    if (onHighlightChange) {
      onHighlightChange(event, index === -1 ? null : filteredOptions[index], reason);
    }
    if (!listboxRef.current) {
      return;
    }
    const prev = listboxRef.current.querySelector(`[role="option"].${unstable_classNamePrefix}-focused`);
    if (prev) {
      prev.classList.remove(`${unstable_classNamePrefix}-focused`);
      prev.classList.remove(`${unstable_classNamePrefix}-focusVisible`);
    }
    const listboxNode = listboxRef.current.parentElement.querySelector('[role="listbox"]');

    // "No results"
    if (!listboxNode) {
      return;
    }
    if (index === -1) {
      listboxNode.scrollTop = 0;
      return;
    }
    const option = listboxRef.current.querySelector(`[data-option-index="${index}"]`);
    if (!option) {
      return;
    }
    option.classList.add(`${unstable_classNamePrefix}-focused`);
    if (reason === 'keyboard') {
      option.classList.add(`${unstable_classNamePrefix}-focusVisible`);
    }

    // Scroll active descendant into view.
    // Logic copied from https://www.w3.org/WAI/ARIA/apg/example-index/combobox/js/select-only.js
    //
    // Consider this API instead once it has a better browser support:
    // .scrollIntoView({ scrollMode: 'if-needed', block: 'nearest' });
    if (listboxNode.scrollHeight > listboxNode.clientHeight && reason !== 'mouse') {
      const element = option;
      const scrollBottom = listboxNode.clientHeight + listboxNode.scrollTop;
      const elementBottom = element.offsetTop + element.offsetHeight;
      if (elementBottom > scrollBottom) {
        listboxNode.scrollTop = elementBottom - listboxNode.clientHeight;
      } else if (element.offsetTop - element.offsetHeight * (groupBy ? 1.3 : 0) < listboxNode.scrollTop) {
        listboxNode.scrollTop = element.offsetTop - element.offsetHeight * (groupBy ? 1.3 : 0);
      }
    }
  });
  const changeHighlightedIndex = (0, _utils.unstable_useEventCallback)(({
    event,
    diff,
    direction = 'next',
    reason = 'auto'
  }) => {
    if (!popupOpen) {
      return;
    }
    const getNextIndex = () => {
      const maxIndex = filteredOptions.length - 1;
      if (diff === 'reset') {
        return defaultHighlighted;
      }
      if (diff === 'start') {
        return 0;
      }
      if (diff === 'end') {
        return maxIndex;
      }
      const newIndex = highlightedIndexRef.current + diff;
      if (newIndex < 0) {
        if (newIndex === -1 && includeInputInList) {
          return -1;
        }
        if (disableListWrap && highlightedIndexRef.current !== -1 || Math.abs(diff) > 1) {
          return 0;
        }
        return maxIndex;
      }
      if (newIndex > maxIndex) {
        if (newIndex === maxIndex + 1 && includeInputInList) {
          return -1;
        }
        if (disableListWrap || Math.abs(diff) > 1) {
          return maxIndex;
        }
        return 0;
      }
      return newIndex;
    };
    const nextIndex = validOptionIndex(getNextIndex(), direction);
    setHighlightedIndex({
      index: nextIndex,
      reason,
      event
    });

    // Sync the content of the input with the highlighted option.
    if (autoComplete && diff !== 'reset') {
      if (nextIndex === -1) {
        inputRef.current.value = inputValue;
      } else {
        const option = getOptionLabel(filteredOptions[nextIndex]);
        inputRef.current.value = option;

        // The portion of the selected suggestion that has not been typed by the user,
        // a completion string, appears inline after the input cursor in the textbox.
        const index = option.toLowerCase().indexOf(inputValue.toLowerCase());
        if (index === 0 && inputValue.length > 0) {
          inputRef.current.setSelectionRange(inputValue.length, option.length);
        }
      }
    }
  });
  const syncHighlightedIndex = React.useCallback(() => {
    if (!popupOpen) {
      return;
    }
    const valueItem = multiple ? value[0] : value;

    // The popup is empty, reset
    if (filteredOptions.length === 0 || valueItem == null) {
      changeHighlightedIndex({
        diff: 'reset'
      });
      return;
    }
    if (!listboxRef.current) {
      return;
    }

    // Synchronize the value with the highlighted index
    if (valueItem != null) {
      const currentOption = filteredOptions[highlightedIndexRef.current];

      // Keep the current highlighted index if possible
      if (multiple && currentOption && findIndex(value, val => isOptionEqualToValue(currentOption, val)) !== -1) {
        return;
      }
      const itemIndex = findIndex(filteredOptions, optionItem => isOptionEqualToValue(optionItem, valueItem));
      if (itemIndex === -1) {
        changeHighlightedIndex({
          diff: 'reset'
        });
      } else {
        setHighlightedIndex({
          index: itemIndex
        });
      }
      return;
    }

    // Prevent the highlighted index to leak outside the boundaries.
    if (highlightedIndexRef.current >= filteredOptions.length - 1) {
      setHighlightedIndex({
        index: filteredOptions.length - 1
      });
      return;
    }

    // Restore the focus to the previous index.
    setHighlightedIndex({
      index: highlightedIndexRef.current
    });
    // Ignore filteredOptions (and options, isOptionEqualToValue, getOptionLabel) not to break the scroll position
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [
  // Only sync the highlighted index when the option switch between empty and not
  filteredOptions.length,
  // Don't sync the highlighted index with the value when multiple
  // eslint-disable-next-line react-hooks/exhaustive-deps
  multiple ? false : value, filterSelectedOptions, changeHighlightedIndex, setHighlightedIndex, popupOpen, inputValue, multiple]);
  const handleListboxRef = (0, _utils.unstable_useEventCallback)(node => {
    (0, _utils.unstable_setRef)(listboxRef, node);
    if (!node) {
      return;
    }
    syncHighlightedIndex();
  });
  if (process.env.NODE_ENV !== 'production') {
    // eslint-disable-next-line react-hooks/rules-of-hooks
    React.useEffect(() => {
      if (!inputRef.current || inputRef.current.nodeName !== 'INPUT') {
        if (inputRef.current && inputRef.current.nodeName === 'TEXTAREA') {
          console.warn([`A textarea element was provided to ${componentName} where input was expected.`, `This is not a supported scenario but it may work under certain conditions.`, `A textarea keyboard navigation may conflict with Autocomplete controls (e.g. enter and arrow keys).`, `Make sure to test keyboard navigation and add custom event handlers if necessary.`].join('\n'));
        } else {
          console.error([`MUI: Unable to find the input element. It was resolved to ${inputRef.current} while an HTMLInputElement was expected.`, `Instead, ${componentName} expects an input element.`, '', componentName === 'useAutocomplete' ? 'Make sure you have binded getInputProps correctly and that the normal ref/effect resolutions order is guaranteed.' : 'Make sure you have customized the input component correctly.'].join('\n'));
        }
      }
    }, [componentName]);
  }
  React.useEffect(() => {
    syncHighlightedIndex();
  }, [syncHighlightedIndex]);
  const handleOpen = event => {
    if (open) {
      return;
    }
    setOpenState(true);
    setInputPristine(true);
    if (onOpen) {
      onOpen(event);
    }
  };
  const handleClose = (event, reason) => {
    if (!open) {
      return;
    }
    setOpenState(false);
    if (onClose) {
      onClose(event, reason);
    }
  };
  const handleValue = (event, newValue, reason, details) => {
    if (multiple) {
      if (value.length === newValue.length && value.every((val, i) => val === newValue[i])) {
        return;
      }
    } else if (value === newValue) {
      return;
    }
    if (onChange) {
      onChange(event, newValue, reason, details);
    }
    setValueState(newValue);
  };
  const isTouch = React.useRef(false);
  const selectNewValue = (event, option, reasonProp = 'selectOption', origin = 'options') => {
    let reason = reasonProp;
    let newValue = option;
    if (multiple) {
      newValue = Array.isArray(value) ? value.slice() : [];
      if (process.env.NODE_ENV !== 'production') {
        const matches = newValue.filter(val => isOptionEqualToValue(option, val));
        if (matches.length > 1) {
          console.error([`MUI: The \`isOptionEqualToValue\` method of ${componentName} do not handle the arguments correctly.`, `The component expects a single value to match a given option but found ${matches.length} matches.`].join('\n'));
        }
      }
      const itemIndex = findIndex(newValue, valueItem => isOptionEqualToValue(option, valueItem));
      if (itemIndex === -1) {
        newValue.push(option);
      } else if (origin !== 'freeSolo') {
        newValue.splice(itemIndex, 1);
        reason = 'removeOption';
      }
    }
    resetInputValue(event, newValue);
    handleValue(event, newValue, reason, {
      option
    });
    if (!disableCloseOnSelect && (!event || !event.ctrlKey && !event.metaKey)) {
      handleClose(event, reason);
    }
    if (blurOnSelect === true || blurOnSelect === 'touch' && isTouch.current || blurOnSelect === 'mouse' && !isTouch.current) {
      inputRef.current.blur();
    }
  };
  function validTagIndex(index, direction) {
    if (index === -1) {
      return -1;
    }
    let nextFocus = index;
    while (true) {
      // Out of range
      if (direction === 'next' && nextFocus === value.length || direction === 'previous' && nextFocus === -1) {
        return -1;
      }
      const option = anchorEl.querySelector(`[data-tag-index="${nextFocus}"]`);

      // Same logic as MenuList.js
      if (!option || !option.hasAttribute('tabindex') || option.disabled || option.getAttribute('aria-disabled') === 'true') {
        nextFocus += direction === 'next' ? 1 : -1;
      } else {
        return nextFocus;
      }
    }
  }
  const handleFocusTag = (event, direction) => {
    if (!multiple) {
      return;
    }
    if (inputValue === '') {
      handleClose(event, 'toggleInput');
    }
    let nextTag = focusedTag;
    if (focusedTag === -1) {
      if (inputValue === '' && direction === 'previous') {
        nextTag = value.length - 1;
      }
    } else {
      nextTag += direction === 'next' ? 1 : -1;
      if (nextTag < 0) {
        nextTag = 0;
      }
      if (nextTag === value.length) {
        nextTag = -1;
      }
    }
    nextTag = validTagIndex(nextTag, direction);
    setFocusedTag(nextTag);
    focusTag(nextTag);
  };
  const handleClear = event => {
    ignoreFocus.current = true;
    setInputValueState('');
    if (onInputChange) {
      onInputChange(event, '', 'clear');
    }
    handleValue(event, multiple ? [] : null, 'clear');
  };
  const handleKeyDown = other => event => {
    if (other.onKeyDown) {
      other.onKeyDown(event);
    }
    if (event.defaultMuiPrevented) {
      return;
    }
    if (focusedTag !== -1 && ['ArrowLeft', 'ArrowRight'].indexOf(event.key) === -1) {
      setFocusedTag(-1);
      focusTag(-1);
    }

    // Wait until IME is settled.
    if (event.which !== 229) {
      switch (event.key) {
        case 'Home':
          if (popupOpen && handleHomeEndKeys) {
            // Prevent scroll of the page
            event.preventDefault();
            changeHighlightedIndex({
              diff: 'start',
              direction: 'next',
              reason: 'keyboard',
              event
            });
          }
          break;
        case 'End':
          if (popupOpen && handleHomeEndKeys) {
            // Prevent scroll of the page
            event.preventDefault();
            changeHighlightedIndex({
              diff: 'end',
              direction: 'previous',
              reason: 'keyboard',
              event
            });
          }
          break;
        case 'PageUp':
          // Prevent scroll of the page
          event.preventDefault();
          changeHighlightedIndex({
            diff: -pageSize,
            direction: 'previous',
            reason: 'keyboard',
            event
          });
          handleOpen(event);
          break;
        case 'PageDown':
          // Prevent scroll of the page
          event.preventDefault();
          changeHighlightedIndex({
            diff: pageSize,
            direction: 'next',
            reason: 'keyboard',
            event
          });
          handleOpen(event);
          break;
        case 'ArrowDown':
          // Prevent cursor move
          event.preventDefault();
          changeHighlightedIndex({
            diff: 1,
            direction: 'next',
            reason: 'keyboard',
            event
          });
          handleOpen(event);
          break;
        case 'ArrowUp':
          // Prevent cursor move
          event.preventDefault();
          changeHighlightedIndex({
            diff: -1,
            direction: 'previous',
            reason: 'keyboard',
            event
          });
          handleOpen(event);
          break;
        case 'ArrowLeft':
          handleFocusTag(event, 'previous');
          break;
        case 'ArrowRight':
          handleFocusTag(event, 'next');
          break;
        case 'Enter':
          if (highlightedIndexRef.current !== -1 && popupOpen) {
            const option = filteredOptions[highlightedIndexRef.current];
            const disabled = getOptionDisabled ? getOptionDisabled(option) : false;

            // Avoid early form validation, let the end-users continue filling the form.
            event.preventDefault();
            if (disabled) {
              return;
            }
            selectNewValue(event, option, 'selectOption');

            // Move the selection to the end.
            if (autoComplete) {
              inputRef.current.setSelectionRange(inputRef.current.value.length, inputRef.current.value.length);
            }
          } else if (freeSolo && inputValue !== '' && inputValueIsSelectedValue === false) {
            if (multiple) {
              // Allow people to add new values before they submit the form.
              event.preventDefault();
            }
            selectNewValue(event, inputValue, 'createOption', 'freeSolo');
          }
          break;
        case 'Escape':
          if (popupOpen) {
            // Avoid Opera to exit fullscreen mode.
            event.preventDefault();
            // Avoid the Modal to handle the event.
            event.stopPropagation();
            handleClose(event, 'escape');
          } else if (clearOnEscape && (inputValue !== '' || multiple && value.length > 0)) {
            // Avoid Opera to exit fullscreen mode.
            event.preventDefault();
            // Avoid the Modal to handle the event.
            event.stopPropagation();
            handleClear(event);
          }
          break;
        case 'Backspace':
          if (multiple && !readOnly && inputValue === '' && value.length > 0) {
            const index = focusedTag === -1 ? value.length - 1 : focusedTag;
            const newValue = value.slice();
            newValue.splice(index, 1);
            handleValue(event, newValue, 'removeOption', {
              option: value[index]
            });
          }
          break;
        case 'Delete':
          if (multiple && !readOnly && inputValue === '' && value.length > 0 && focusedTag !== -1) {
            const index = focusedTag;
            const newValue = value.slice();
            newValue.splice(index, 1);
            handleValue(event, newValue, 'removeOption', {
              option: value[index]
            });
          }
          break;
        default:
      }
    }
  };
  const handleFocus = event => {
    setFocused(true);
    if (openOnFocus && !ignoreFocus.current) {
      handleOpen(event);
    }
  };
  const handleBlur = event => {
    // Ignore the event when using the scrollbar with IE11
    if (unstable_isActiveElementInListbox(listboxRef)) {
      inputRef.current.focus();
      return;
    }
    setFocused(false);
    firstFocus.current = true;
    ignoreFocus.current = false;
    if (autoSelect && highlightedIndexRef.current !== -1 && popupOpen) {
      selectNewValue(event, filteredOptions[highlightedIndexRef.current], 'blur');
    } else if (autoSelect && freeSolo && inputValue !== '') {
      selectNewValue(event, inputValue, 'blur', 'freeSolo');
    } else if (clearOnBlur) {
      resetInputValue(event, value);
    }
    handleClose(event, 'blur');
  };
  const handleInputChange = event => {
    const newValue = event.target.value;
    if (inputValue !== newValue) {
      setInputValueState(newValue);
      setInputPristine(false);
      if (onInputChange) {
        onInputChange(event, newValue, 'input');
      }
    }
    if (newValue === '') {
      if (!disableClearable && !multiple) {
        handleValue(event, null, 'clear');
      }
    } else {
      handleOpen(event);
    }
  };
  const handleOptionMouseOver = event => {
    setHighlightedIndex({
      event,
      index: Number(event.currentTarget.getAttribute('data-option-index')),
      reason: 'mouse'
    });
  };
  const handleOptionTouchStart = () => {
    isTouch.current = true;
  };
  const handleOptionClick = event => {
    const index = Number(event.currentTarget.getAttribute('data-option-index'));
    selectNewValue(event, filteredOptions[index], 'selectOption');
    isTouch.current = false;
  };
  const handleTagDelete = index => event => {
    const newValue = value.slice();
    newValue.splice(index, 1);
    handleValue(event, newValue, 'removeOption', {
      option: value[index]
    });
  };
  const handlePopupIndicator = event => {
    if (open) {
      handleClose(event, 'toggleInput');
    } else {
      handleOpen(event);
    }
  };

  // Prevent input blur when interacting with the combobox
  const handleMouseDown = event => {
    if (event.target.getAttribute('id') !== id) {
      event.preventDefault();
    }
  };

  // Focus the input when interacting with the combobox
  const handleClick = () => {
    inputRef.current.focus();
    if (selectOnFocus && firstFocus.current && inputRef.current.selectionEnd - inputRef.current.selectionStart === 0) {
      inputRef.current.select();
    }
    firstFocus.current = false;
  };
  const handleInputMouseDown = event => {
    if (inputValue === '' || !open) {
      handlePopupIndicator(event);
    }
  };
  let dirty = freeSolo && inputValue.length > 0;
  dirty = dirty || (multiple ? value.length > 0 : value !== null);
  let groupedOptions = filteredOptions;
  if (groupBy) {
    // used to keep track of key and indexes in the result array
    const indexBy = new Map();
    let warn = false;
    groupedOptions = filteredOptions.reduce((acc, option, index) => {
      const group = groupBy(option);
      if (acc.length > 0 && acc[acc.length - 1].group === group) {
        acc[acc.length - 1].options.push(option);
      } else {
        if (process.env.NODE_ENV !== 'production') {
          if (indexBy.get(group) && !warn) {
            console.warn(`MUI: The options provided combined with the \`groupBy\` method of ${componentName} returns duplicated headers.`, 'You can solve the issue by sorting the options with the output of `groupBy`.');
            warn = true;
          }
          indexBy.set(group, true);
        }
        acc.push({
          key: index,
          index,
          group,
          options: [option]
        });
      }
      return acc;
    }, []);
  }
  if (disabledProp && focused) {
    handleBlur();
  }
  return {
    getRootProps: (other = {}) => (0, _extends2.default)({
      'aria-owns': listboxAvailable ? `${id}-listbox` : null
    }, other, {
      onKeyDown: handleKeyDown(other),
      onMouseDown: handleMouseDown,
      onClick: handleClick
    }),
    getInputLabelProps: () => ({
      id: `${id}-label`,
      htmlFor: id
    }),
    getInputProps: () => ({
      id,
      value: inputValue,
      onBlur: handleBlur,
      onFocus: handleFocus,
      onChange: handleInputChange,
      onMouseDown: handleInputMouseDown,
      // if open then this is handled imperativeley so don't let react override
      // only have an opinion about this when closed
      'aria-activedescendant': popupOpen ? '' : null,
      'aria-autocomplete': autoComplete ? 'both' : 'list',
      'aria-controls': listboxAvailable ? `${id}-listbox` : undefined,
      'aria-expanded': listboxAvailable,
      // Disable browser's suggestion that might overlap with the popup.
      // Handle autocomplete but not autofill.
      autoComplete: 'off',
      ref: inputRef,
      autoCapitalize: 'none',
      spellCheck: 'false',
      role: 'combobox'
    }),
    getClearProps: () => ({
      tabIndex: -1,
      onClick: handleClear
    }),
    getPopupIndicatorProps: () => ({
      tabIndex: -1,
      onClick: handlePopupIndicator
    }),
    getTagProps: ({
      index
    }) => (0, _extends2.default)({
      key: index,
      'data-tag-index': index,
      tabIndex: -1
    }, !readOnly && {
      onDelete: handleTagDelete(index)
    }),
    getListboxProps: () => ({
      role: 'listbox',
      id: `${id}-listbox`,
      'aria-labelledby': `${id}-label`,
      ref: handleListboxRef,
      onMouseDown: event => {
        // Prevent blur
        event.preventDefault();
      }
    }),
    getOptionProps: ({
      index,
      option
    }) => {
      const selected = (multiple ? value : [value]).some(value2 => value2 != null && isOptionEqualToValue(option, value2));
      const disabled = getOptionDisabled ? getOptionDisabled(option) : false;
      return {
        key: getOptionLabel(option),
        tabIndex: -1,
        role: 'option',
        id: `${id}-option-${index}`,
        onMouseOver: handleOptionMouseOver,
        onClick: handleOptionClick,
        onTouchStart: handleOptionTouchStart,
        'data-option-index': index,
        'aria-disabled': disabled,
        'aria-selected': selected
      };
    },
    id,
    inputValue,
    value,
    dirty,
    popupOpen,
    focused: focused || focusedTag !== -1,
    anchorEl,
    setAnchorEl,
    focusedTag,
    groupedOptions
  };
}